1. Department of Trauma and Orthopaedic Surgery, Witten/Herdecke University, Cologne Merheim Medical Centre, Köln, Germany
2. Department of Orthopaedic Surgery and Sports Traumatology, Beta Clinic Bonn, Bonn, Germany
3. Department of Radiology and Radiation Oncology, University Hospital Bonn, Rheinische-Friedrich-Wilhelms-Universität Bonn, Bonn, Germany
4. Orthopaedic Surgery Munich, OCM Klinik GmbH, München, Germany
5. Department of Orthopaedic Surgery and Sports Traumatology, Witten/Herdecke University, Sana Medical Centre Cologne, Köln, Germany